.black_overlay{
    display: none;
    position: absolute;
    top: 0%;
    left: 0%;
    width: 100%;
    height: 100%;
    background-color: white;
    z-index:1001;
    -moz-opacity: 0;
    opacity:0;
    filter: alpha(opacity=0);
}
.white_content {
    display: none;
    position: absolute;
    top: 25%;
    left: 25%;
    width: 50%;
    height: 50%;
    padding: 1px;
    border: 1px solid;
    background-color: #ffffff;
    z-index:1002;
    overflow: auto;
}